MIL‐68(In)‐derived In 2 O 3 /In 2 S 3 /C: In situ synthesis and efficient visible‐light photocatalytic H 2 O 2 generation

Photocatalytic reduction of O 2 to generate H 2 O 2 shows an excellent environment friendly nature and the controllable H 2 O 2 concentrations and is found the prospect of applications in H 2 O 2 ‐assisted redox. In this paper, MIL‐68(In) is chosen as a sacrifice precursor to construct a multi‐component photocatalyst of In 2 O 3 /In 2 S 3 /C by integrated in situ sulfidation and pyrolysis routes. The resulting In 2 O 3 /In 2 S 3 /C inherited the geometry of MIL‐68(In) and represents the hollow microtube with rough surface. The photocatalytic activity of the In 2 O 3 /In 2 S 3 /C in H 2 O 2 generation is investigated systematically, and the contrast tests were conducted over the In 2 S 3 /MIL‐68 synthesized by in situ sulfidation but without subsequent pyrolysis, to explore the advantages of the In 2 O 3 /In 2 S 3 /C heterostructure. The best photocatalytic H 2 O 2 evolution is observed by the In 2 O 3 /In 2 S 3 /C with a value of 934.6 μmol/L within 1 h, which is higher than that by In 2 S 3 /MIL‐68 and other previously reported photocatalysts. The photoelectrochemical analyses and ESR measurements clarify that contact heterojunction and matched band potentials are responsible for the effective separation of electrons and holes, and the O 2 ·‐ are the main active species in the photocatalytic H 2 O 2 evolution. The outstanding photocatalytic activity, structure stability, and the easily regulated H 2 O 2 concentrations render the In 2 O 3 /In 2 S 3 /C the prospect applications in the H 2 O 2 ‐assisted redox reactions.